Ответ:
happy - happier - the happiest
young - younger - the youngest
shallow - shallower - the shallowest
difficult - more difficult - the most difficult
dirty - dirtier - the dirtiest
patient - more patient - the most patient
hot - hotter - the hottest
comfortable - more comfortable - the most comfortable
brave - braver - the bravest
friendly - friendlier - the friendliest
ridiculous - more ridiculous - the most ridiculous
late - later - the latest (второй вариант late - latter - the last)
little - less - the least